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#!/usr/bin/env python3
#
# IDC to IRC proxy (based off an old miniirc proxy)
#
# © 2022 by luk3yx
#
import datetime, miniirc, miniirc_idc, os, socket, threading, traceback
from concurrent.futures import ThreadPoolExecutor
from miniirc_extras.utils import (ircv2_message_unparser, ircv3_message_parser,
ircv3_message_unparser)
# A single network
class Proxy:
_buffer = b''
IRC = miniirc_idc.IDC
encoding = 'utf-8'
_001 = False
block_incoming = frozenset(('PING', 'CAP', 'AUTHENTICATE'))
block_outgoing = frozenset(('CAP',))
_advertised_caps = frozenset((
'server-time', 'message-tags', 'account-tag', 'echo-message'
))
# Create the IRC object
def __init__(self, conn, *args, **kwargs):
self.sock = conn
self.irc = self.IRC(*args, auto_connect=False,
executor=ThreadPoolExecutor(1), **kwargs)
self._irc_msg_unparser = ircv2_message_unparser
# Add the IRC handler
self.irc.CmdHandler(ircv3=True, colon=False)(self._miniirc_handler)
# Start the main loop
self.thread = threading.Thread(target=self._init_thread)
self.thread.start()
# Send messages
def send(self, cmd, hostmask, tags, args):
if hostmask == ('', '', ''):
hostmask = None
raw = self._irc_msg_unparser(
cmd, hostmask or (cmd, cmd, cmd), tags, args, colon=False,
encoding=self.encoding
)
self.sock.sendall(raw + b'\r\n')
# Receive messages
def recv(self):
while True:
while b'\n' not in self._buffer:
buf = self.sock.recv(4096)
if not buf:
raise BrokenPipeError
self._buffer += buf.replace(b'\r', b'\n')
msg, self._buffer = self._buffer.split(b'\n', 1)
msg = msg.decode(self.encoding, 'replace')
if msg:
cmd, _, tags, args = ircv3_message_parser(msg, colon=False)
return tags, cmd.upper(), args
# Handle everything
def _miniirc_handler(self, irc, cmd, hostmask, tags, args):
if cmd.startswith('IRCV3 ') or cmd in self.block_incoming:
return
elif cmd == '001':
if self._001:
return
self._001 = True
# Clear the SendQ
if self._sendq:
while len(self._sendq) > 0:
self._sendcmd(*self._sendq.pop(0))
# Start the main loop
threading.Thread(target=self._main).start()
elif cmd == 'ERROR':
self.send('PING', None, {}, [':ERROR'])
elif cmd == 'PONG':
# Translate proxied pings back
if not args or not args[-1].startswith('proxy:'):
return
args = [args[0], args[-1][6:]]
elif cmd == 'PRIVMSG' and ('\n' in args[-1] or '\r' in args[-1]):
message = args[-1].replace('\r\n', '\n').replace('\r', '\n')
if 'time' not in tags:
tags = {
'time': datetime.datetime.utcnow().isoformat(
timespec='milliseconds'
) + 'Z',
**tags
}
for i, line in enumerate(message.split('\n', 9)):
if i > 0:
line = '\u200b' + line
self.send(cmd, hostmask, tags, [args[0], line])
if i == 0:
tags = {'time': tags['time']}
return
# Send the command to the client
try:
self.send(cmd, hostmask, tags, args)
except Exception:
traceback.print_exc()
self.irc.disconnect('Connection closed.', auto_reconnect=False)
# The initial main loop
def _init_thread(self):
self._sendq = []
nick = None
user = None
cap_negotiation = False
# Wait for NICK and USER to be sent
while cap_negotiation or not nick or not user:
try:
tags, cmd, args = self.recv()
except BrokenPipeError:
return
if cmd == 'NICK' and len(args) == 1:
nick = args[0]
elif cmd == 'USER' and len(args) > 1:
user = args
elif cmd == 'CAP' and args:
subcmd = args[0].upper()
if subcmd == 'LS':
cap_negotiation = True
self.send('CAP', None, {},
('*', 'LS', ' '.join(self._advertised_caps)))
elif subcmd == 'REQ':
cap_negotiation = True
requested_caps = frozenset(args[-1].split(' '))
if requested_caps - self._advertised_caps:
self.send('CAP', None, {}, ('*', 'NAK', args[-1]))
continue
if 'message-tags' in requested_caps:
self._irc_msg_unparser = ircv3_message_unparser
if 'echo-message' in requested_caps:
self.irc.ircv3_caps.add('echo-message')
self.send('CAP', None, {}, ('*', 'ACK', args[-1]))
elif subcmd == 'END':
cap_negotiation = False
else:
self.send('410', None, {},
('*', subcmd, 'Invalid CAP subcommand'))
elif cmd == 'QUIT':
self.sock.shutdown(socket.SHUT_RDWR)
self.sock.close()
return
elif cmd == 'PING':
self.send('PONG', None, {}, args)
else:
self._sendq.append((tags, cmd, args))
# Set values
self.irc.nick = nick
self.irc.ident = user[0]
self.irc.realname = user[-1]
# Connect
self.irc.connect()
# Send a command
def _sendcmd(self, tags, cmd, args):
if cmd in self.block_outgoing:
return
if cmd == 'PING':
args = [f'proxy:{args[0] if args else ""}']
raw = ircv2_message_unparser(cmd, (cmd, cmd, cmd), {}, args,
colon=False, encoding=None)
self.irc.quote(raw, tags=tags)
# The more permanent main loop
def _main(self, single_thread=False):
# Send everything to IRC
while True:
try:
tags, cmd, args = self.recv()
except Exception:
traceback.print_exc()
return self.irc.disconnect()
self._sendcmd(tags, cmd, args)
# The proxy class
class Server:
Proxy = Proxy
def __init__(self, *args, local_addr, **kwargs):
self.addr = local_addr
self.args, self.kwargs = args, kwargs
def main(self):
# Create a socket object
with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as sock:
sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
sock.bind(self.addr)
sock.listen(1)
conn, _ = sock.accept()
with conn:
net = self.Proxy(conn, *self.args, **self.kwargs)
net.thread.join()
net.irc.wait_until_disconnected()
def main():
import argparse
parser = argparse.ArgumentParser()
parser.add_argument('bind_port', type=int)
parser.add_argument('username')
parser.add_argument('password')
parser.add_argument('--debug', '-v', action='store_true')
parser.add_argument('--idc-ip', default='andrewyu.org')
parser.add_argument('--idc-port', type=int, default=6835)
args = parser.parse_args()
Server(args.idc_ip, args.idc_port, '', ssl=True, persist=False,
local_addr=('127.0.0.1', args.bind_port), debug=args.debug,
ns_identity=(args.username, args.password)).main()
if __name__ == '__main__':
main()
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